<TelerikContextMenu @ref="@ContextMenuRef" />

@code {
    private TelerikContextMenu<ContextMenuItem> ContextMenuRef { get; set; }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender && ContextMenuRef is not null)
        {
            await Task.Delay(1);
            await ContextMenuRef.ShowAsync(1, 1);
            await ContextMenuRef.HideAsync();
        }
    }
}